31023142321 has 4 divisors (see below), whose sum is σ = 31065815872. Its totient is φ = 30980468772.

The previous prime is 31023142307. The next prime is 31023142327. The reversal of 31023142321 is 12324132013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31023142321 - 2¹¹ = 31023140273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31023142292 and 31023142301.

It is not an unprimeable number, because it can be changed into a prime (31023142327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21335685 + ... + 21337138.

It is an arithmetic number, because the mean of its divisors is an integer number (7766453968).

Almost surely, 2^31023142321 is an apocalyptic number.

It is an amenable number.

31023142321 is a deficient number, since it is larger than the sum of its proper divisors (42673551).

31023142321 is an equidigital number, since it uses as much as digits as its factorization.

31023142321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42673550.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31023142321 its reverse (12324132013), we get a palindrome (43347274334).

The spelling of 31023142321 in words is "thirty-one billion, twenty-three million, one hundred forty-two thousand, three hundred twenty-one".